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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:11:06 PM
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UCREFRP
UCREFRP Catalog Number
9699
Author
Brunson, R.E., and K.D. Christopherson.
Title
Larval razorback sucker and bonytail survival and growth in the presence of nonnative fish in the Baeser floodplain wetland of the middle Green River.
USFW Year
2005.
USFW - Doc Type
Utah Division of Wildlife Resources, Vernal, Utah.
Copyright Material
NO
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was quite variable ranging from no survival in enclosures stocked at 18,000, 1,200 and <br />8001arvae/acre to 11 °Io survival in an enclosure stocked at 36,000 larvae/acre. Survival <br />of razorback sucker larvae in the enclosure that had a significantly higher composition of <br />black bullhead was 3.95%. This was the third highest estimated survival rate among the <br />twelve enclosures. <br />These survival estimates are conservative, based on the likelihood of escapement <br />from the enclosures of larval razorback sucker. Escapement was evaluated by setting <br />nine fyke nets outside and on the perimeter of the enclosures for three nights in 2003. <br />Nonnative species and one bonytail was all that was captured with this effort. <br />Larval razorback sucker stocked into the experimental enclosures on 20 June <br />2003 had grown to a mean length of 49 mm at the time of sampling. Growth rates <br />averaged 0.6 mm/day for the average of 64 days they were in the enclosures. Growth <br />rates ranged from 0.40mm/day in and enclosure stocked at 18,000 larvae/acre to <br />0.92mm/day in and enclosure stocked at 4,000 larvae/acre. Surviving razorback sucker <br />were transferred to The Stirrup floodplain wetland. <br />Abundance estimates of nonnative species in each enclosure ranged from 3,993 <br />to 15,216 in 2003. Enclosures with higher nonnative fish densities showed comparable <br />survival of razorback sucker as the enclosures containing lower densities of nonnative <br />fish (Table 6; Figure 1). The highest razorback sucker survival was detected in an <br />enclosure with the third highest density of nonnative fish. <br />11 <br />
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